#define _CRT_SECURE_NO_WARNINGS 1



#include <stdio.h>

int main()
{
	double a = 0.0;
	scanf("%lf", &a);
	int count = 1;
	int i = 0;
	while ((int)a > 1)
	{
		a /= 2;
		count++;
	}
	printf("%d", count);
	return 0;
}